阅读说明：本技术 一种耐高温电容器用聚丙烯薄膜及其制备方法 (Polypropylene film for high-temperature-resistant capacitor and preparation method thereof ) 是由 张晨晨 丁国成 杨海涛 吴兴旺 尹睿涵 朱太云 秦少瑞 胡啸宇 于 2020-06-05 设计创作，主要内容包括：本发明提供了一种耐高温电容器用聚丙烯薄膜及其制备方法,其包括聚丙烯基膜层以及分别设置在聚丙烯基膜层两个面的耐高温层以及耐候层,并在耐高温层添加Mn元素以及纳米石墨烯,并制备成蜂窝状结构,有助于提高聚丙烯薄膜整体的耐高温性能,且聚丙烯基膜层在在制备的过程中添加金属离子,有助于在后续的升温扩散处理步骤中,聚丙烯基膜层与镀锌层的紧密度,使得镀锌层与镀铝层不仅能形成致密的镀层,达到耐候的效果,还解决了现有技术中镀层容易脱落,不耐磨和热变形的问题。且制备的聚丙烯薄膜应用在电容器制备中,耐高温层含有的纳米石墨烯能提高电容器的电气性能,还具有电容器承受电流能力高、寿命长发,易储存的优点。(The invention provides a polypropylene film for a high-temperature-resistant capacitor and a preparation method thereof, wherein the polypropylene film comprises a polypropylene-based film layer, and a high-temperature-resistant layer and a weather-resistant layer which are respectively arranged on two surfaces of the polypropylene-based film layer, Mn element and nano graphene are added into the high-temperature-resistant layer to prepare a honeycomb structure, so that the whole high-temperature-resistant performance of the polypropylene film is improved, metal ions are added into the polypropylene-based film layer in the preparation process, the compactness between the polypropylene-based film layer and a zinc coating layer in the subsequent heating diffusion treatment step is improved, a compact coating layer can be formed by the zinc coating layer and the aluminum coating layer, the weather-resistant effect is achieved, and the problems that the coating layer is easy to fall off, and is not wear-resistant. The prepared polypropylene film is applied to the preparation of the capacitor, the nano graphene contained in the high-temperature resistant layer can improve the electrical performance of the capacitor, and the high-temperature resistant layer also has the advantages of high current bearing capacity, long service life and easiness in storage.)

1. A polypropylene film for a high-temperature-resistant capacitor comprises a polypropylene-based film layer, and is characterized in that one surface of the polypropylene-based film layer is connected with a high-temperature-resistant layer, the other surface of the polypropylene-based film layer is plated with a weather-resistant layer, and the high-temperature-resistant layer is a honeycomb structure formed by a waste metalized polypropylene film through a recycling process; the preparation process of the polypropylene-based film layer comprises the step of injecting the dosage of 10¹⁰-10¹⁵/cm²The metal ion of (1).

2. The polypropylene film for high-temperature-resistant capacitor as claimed in claim 1, wherein the preparation process of the high-temperature-resistant layer is as follows: recovering the waste metallized polypropylene film and putting the waste metallized polypropylene film into a sulfuric acid washing solution with the concentration of 10-15% to soak for 10-15 min; after the first washing, continuously putting the mixture into acid washing solution with the pH value of 3.4-6.2 for soaking for 30-60 min; after the second washing and draining, polypropylene film fragments are formed under the action of a rolling machine, the fragments are put into a rotary heating furnace for rotary heating to soften the polypropylene film fragments, and Mn element and nano graphene are added under the condition of keeping constant temperature; continuously rotating and heating for 15-20min at a certain rotation speed, and rapidly opening the valve to obtain a high-temperature-resistant layer material; the high temperature resistant layer material is placed under a machine with a honeycomb structure to act.

3. The polypropylene film for high temperature capacitor as claimed in claim 1, wherein the process for preparing the polypropylene-based film layer further comprises: selecting electrical grade isotactic regular acrylic resin, pressurizing, mixing and plasticizing to form a fully plasticized melt, and removing impurities and unmelted substances in the melt through a prefilter and a precision filter; injecting acrylic resin into a T-shaped die head, extruding a sheet-shaped molten body through a lip of the die head, and shaping two sides of the molten body into a polypropylene-based film layer through a chill roll.

4. The polypropylene film for high-temperature-resistant capacitors as claimed in claim 1, wherein the voids of the honeycomb structure are filled with a dielectric material.

5. The polypropylene film for high-temperature-resistant capacitors as claimed in claim 1, wherein the metal ions are one or more of Zr ions, Zn ions and Al ions.

6. The polypropylene film for high temperature capacitor as claimed in claim 1, wherein the weather-resistant layer comprises zinc plating and aluminum plating.

7. The polypropylene film for a high-temperature-resistant capacitor as claimed in claim 2, wherein the Mn element is added in an amount of 0.001-0.003% by mass based on the high-temperature-resistant layer.

8. The polypropylene film for the high-temperature-resistant capacitor as claimed in claim 2, wherein the nano graphene is added in an amount of 0.01-0.05% by mass of the high-temperature-resistant layer.

9. The polypropylene film for high temperature capacitor as claimed in claim 2, wherein the rotation speed is 350-500 r/min.

10. A method for preparing the polypropylene film for high temperature resistant capacitor as claimed in any one of claims 1 to 9, comprising the steps of:

s1, preprocessing the prepared polypropylene-based film layer: carrying out corona discharge treatment on the polypropylene-based film layer, and then carrying out aging treatment for multiple times;

s2, feeding the pre-treated polypropylene-based film layer into a vacuum coating machine, feeding zinc metal into an evaporation crucible through a conveying mechanism in the vacuum coating machine, changing the zinc metal from a zinc melt into zinc vapor in the evaporation crucible, and performing vacuum evaporation coating operation on the corona surface of the polypropylene-based film layer in a coating chamber to form a zinc coating;

s3, feeding an aluminum wire into the evaporation crucible, changing the aluminum wire from aluminum melt into aluminum vapor in the evaporation crucible, and continuing to perform vacuum evaporation operation on the upper surface of the zinc coating in the coating chamber under the action of the ultrasonic generator to form an aluminum coating;

s4, performing temperature-rising diffusion treatment;

s5, connecting the prepared high-temperature-resistant material with the honeycomb structure to the non-corona surface of the polypropylene-based film layer to prepare the polypropylene film for the high-temperature-resistant capacitor.

Technical Field

The invention relates to the technical field of electronic components, in particular to a polypropylene film for a high-temperature-resistant capacitor and a preparation method thereof.

Background

The polypropylene film capacitor has many excellent characteristics as an important electronic element, and is widely applied to direct current and pulse circuits of television, radio and recorder, DVD and various communication equipment and electronic instruments. In the prior art, the electrical property, the insulating property and the heat resistance of the capacitor are improved by pouring some materials between the shell and the core of the capacitor, but the problems of uneven pouring, bubbles and cracking often exist in the process of pouring the materials, and the heat resistance can not meet the requirements of consumers. In addition, in the capacitor using the polypropylene film as the capacitor inductor, in the environment of temperature rise in the engine room and in consideration of self-heating of the capacitor, the polypropylene film is subjected to simple surface metallization in the prior art, but the surface metallization coating has the defects of poor fastness, poor compactness, easy falling, poor wear resistance, thermal deformation and the like, so that the problems of capacity fluctuation and instability caused by moisture invasion in the use process of the capacitor occur.

Disclosure of Invention

The invention provides a polypropylene film for a high-temperature-resistant capacitor and a preparation method thereof, and aims to solve the problems that the polypropylene film for the capacitor in the prior art is poor in heat resistance and electrical property, and a metalized coating is poor in fastness, easy to fall off, not wear-resistant, not thermally deformed and the like.

In order to solve the problems, the invention adopts the following technical scheme:

a polypropylene film for a high-temperature-resistant capacitor comprises a polypropylene-based film layer, wherein one surface of the polypropylene-based film layer is connected with a high-temperature-resistant layer, the other surface of the polypropylene-based film layer is plated with a weather-resistant layer, and the high-temperature-resistant layer is of a honeycomb structure formed by a waste metalized polypropylene film through a recycling process; the preparation process of the polypropylene-based film layer comprises the step of injecting the dosage of 10¹⁰-10¹⁵/cm²The metal ion of (1).

Optionally, the preparation process of the high temperature resistant layer is as follows: recovering the waste metallized polypropylene film and putting the waste metallized polypropylene film into a sulfuric acid washing solution with the concentration of 10-15% to soak for 10-15 min; after the first washing, continuously putting the mixture into acid washing solution with the pH value of 3.4-6.2 for soaking for 30-60 min; after the second washing and draining, polypropylene film fragments are formed under the action of a rolling machine, the fragments are put into a rotary heating furnace for rotary heating to soften the polypropylene film fragments, and Mn element and nano graphene are added under the condition of keeping constant temperature; continuously rotating and heating for 15-20min at a certain rotation speed, and rapidly opening the valve to obtain a high-temperature-resistant layer material; the high temperature resistant layer material is placed under a machine with a honeycomb structure to act.

Optionally, the preparation process of the polypropylene-based film layer further comprises: selecting electrical grade isotactic regular acrylic resin, pressurizing, mixing and plasticizing to form a fully plasticized melt, removing impurities and unmelted substances in the melt through a prefilter and a precision filter, injecting the acrylic resin into a T-shaped die head, extruding a sheet-shaped melt through a lip of the die head, and shaping two sides of the sheet-shaped melt into a polypropylene-based film layer through a chill roll.

Optionally, the voids of the honeycomb structure are filled with a dielectric material.

Optionally, the metal ions are one or more of Zr ions, Zn ions, and Al ions.

Optionally, the weathering layer includes a zinc plating and an aluminum plating.

Optionally, the addition amount of the Mn element is 0.001 to 0.003 mass% of the high temperature resistant layer.

Optionally, the addition amount of the nano graphene accounts for 0.01 to 0.05 percent of the mass of the high temperature resistant layer.

Optionally, the rotation speed is 350-.

In addition, the invention also provides a preparation method of the polypropylene film for the high-temperature resistant capacitor, which comprises the following steps:

s1, preprocessing the prepared polypropylene-based film layer: carrying out corona discharge treatment on the polypropylene-based film layer, and then carrying out aging treatment for multiple times;

s2, feeding the pre-treated polypropylene-based film layer into a vacuum coating machine, feeding zinc metal into an evaporation crucible through a conveying mechanism in the vacuum coating machine, changing the zinc metal from a zinc melt into zinc vapor in the evaporation crucible, and performing vacuum evaporation coating operation on the corona surface of the polypropylene-based film layer in a coating chamber to form a zinc coating;

s3, feeding an aluminum wire into the evaporation crucible, changing the aluminum wire from aluminum melt into aluminum vapor in the evaporation crucible, and continuing to perform vacuum evaporation operation on the upper surface of the zinc coating in the coating chamber under the action of the ultrasonic generator to form an aluminum coating;

s4, performing temperature-rising diffusion treatment;

s5, connecting the prepared high-temperature-resistant material with the honeycomb structure to the non-corona surface of the polypropylene-based film layer to prepare the polypropylene film for the high-temperature-resistant capacitor.

Compared with the prior art, the invention has the beneficial technical effects that:

1. the polypropylene film disclosed by the invention is applied to the preparation of a capacitor, has the advantage of obvious high temperature resistance, and the high temperature resistant layer is arranged into a honeycomb structure, so that the homogenization of heat generated by self-heating inside the capacitor is facilitated, and the improvement of the overall heat resistance of the polypropylene film is facilitated.

2. The high-temperature resistant layer recycles the waste metalized polypropylene film, is beneficial to recycling waste, realizes the maximum utilization of resources and reduces the production cost.

3. In addition, the metal ions in the polypropylene-based film layer can also promote the compactness of the polypropylene-based film layer and the zinc coating layer in the heating diffusion treatment process, so that the zinc coating layer and the aluminum coating layer can not only form a compact oxide layer to achieve the weather-resistant effect, but also solve the problems of easy falling off of the coating layer, no wear resistance and thermal deformation in the prior art.

4. The polypropylene film prepared by the invention is applied to the preparation of the capacitor, and the nano graphene contained in the high-temperature resistant layer is beneficial to improving the electrical performance of the capacitor, and also has the advantages of high current bearing capacity, long service life and easiness in storage.

Drawings

The invention will be further understood from the following description in conjunction with the accompanying drawings.

FIG. 1 is a schematic flow chart of a process for preparing a polypropylene film for a high temperature resistant capacitor according to an embodiment of the present invention;

FIG. 2 is a schematic view of a polypropylene film for a high temperature capacitor according to an embodiment of the present invention;

FIG. 3 is a schematic view showing a honeycomb structure of a high temperature resistant layer in a polypropylene film for a high temperature resistant capacitor in accordance with one embodiment of the present invention.

Reference numerals:

1-a polypropylene-based film layer; 2-high temperature resistant layer; 3-zinc coating; 4-aluminum plating.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

The invention relates to a polypropylene film for a high-temperature resistant capacitor and a preparation method thereof, which are shown in figures 1-3 and describe the following examples: